mfd: vexpress-sysreg: Initialize 'site' variable

'site' variable should be initialized with 0 so that when 'site'
property doesn't exist in DTB it can be handled correctly.

'0' value means board site number is motherboard (see
Documentation/devicetree/bindings/arm/vexpress.txt for details).
Signed-off-by: Semen Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/vexpress-sysreg.c

@@ -168,7 +168,7 @@ static void *vexpress_sysreg_config_func_get(struct device *dev,
 		struct device_node *node)
 {
 	struct vexpress_sysreg_config_func *config_func;
-	u32 site;
+	u32 site = 0;
 	u32 position = 0;
 	u32 dcc = 0;
 	u32 func_device[2];